1. The humor is simply the unexpected result that only the bag was hitchhiking, and not Horace. This explains why he is still smiling in the third panel. I also thought that part of the joke was that he had to wear a glove not only in order to show a thumb to signal the car to stop, but also to wave farewell.

    P.S. If Horace had been angry at not getting a ride, he could have altered the glove to extend a different finger.

  2. Kilby, I didn’t think about Horace needing a glove because he regularly plays intricate guitar runs with his hooves.

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